Semiautomatic Segmentation of Ventilated Airspaces in Healthy and Asthmatic Subjects Using Hyperpolarized ³He MRI

Table 2

Summary of ventilated lung volumes measurements and the corresponding dice coefficients.

	VLV; Semiautomatic; segmentation (L)	VLV; Manual; segmentation (L)	Dice; coefficient
Healthy
H1	3.05	3.14	0.96
H2	3.82	3.73	0.97
H3	4.88	4.87	0.96
H4	3.78	3.84	0.96
Asthmatic
A1	3.50	3.55	0.96
A2	3.24	3.19	0.97
A3	3.16	3.14	0.96
A4	6.04	6.19	0.96
A5	3.80	3.80	0.96
A6	3.23	3.23	0.95